cat /home/ovs/clus.xml

<network>
<name>clus</name>
<forward mode='bridge'/>
<bridge name='br64'/>
<virtualport type='openvswitch'/>
</network>

далее

virsh net-define /home/ovs/clus.xml
virsh net-start clus
virsh net-autostart clus
virsh attach-interface --domain VM1 --type network --source clus --model e1000 --persistent

yum install -y rpm-build
yum groupinstall -y "Development Tools"
yum install -y openssl-devel
wget http://openvswitch.org/releases/openvswitch-2.3.3.tar.gz
mkdir -p /root/rpmbuild/SOURCES
cp openvswitch-2.3.3.tar.gz /root/rpmbuild/SOURCES
cd /root/rpmbuild/SOURCES
tar -xvf openvswitch-2.3.3.tar.gz

удалить зависимость на строке Requires. удаляем openvswitch-kmod
vi openvswitch-2.3.3/rhel/openvswitch.spec
cd openvswitch-2.3.3
rpmbuild -bb -D `uname -r` rhel/openvswitch.spec
yum localinstall /root/rpmbuild/RPMS/x86_64/openvswitch-2.3.3-1.x86_64.rpm
/etc/init.d/openvswitch start